Well they know they cannot provide any proof of Pakistani Troops firing the first shot hence blaming Taliban now!It was deliberate Operation IMHO and we may get to know the motive of this op maybe after a year or so?
The motive could be that they made a mistake, but the evidence thus far alludes otherwise.
The more complicated motive, the one that I subscribe to, is that they launched the attack to provoke a response from our side, which in turn would have given them the excuse to carry out operations deeper into Pakistani territory.
The fact that the Pakistani side has decided not to react militarily, even if we did it would not gain us much aside from increased pressure, is the smart thing to do. People are starting to realize that ISAF wants the ability to engage inside of Pakistan in a repeat of what went on in Cambodia.
I am quoting M K Bhadrakumar's comments in an article yesterday or so:
"Washington may have seriously erred if the intention Friday night was to draw out the Pakistani military into a retaliatory mode and then to hit it with a sledgehammer and make it crawl on its knees pleading mercy. Things aren't going to work that way. Pakistan is going to give a "Persian" response."
It is pretty sad as to how the US has lost its way for tactical gains in Afghanistan by losing out on a fairly long term relationship with Pakistan going back many decades.
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Pakistan was invited but refused. Big blunder.
And ISPR needs to work HARD this time to propagate the Pakistani PoV.
Pakistan refused based on the track record of the past investigations. No less than the most informed person in the Pakistan Army, i.e. DGMO, has made comments addressing this specific issue. That he is biased towards Pakistan is obviously a factor, however he was also privy to the reports from these investigations in the past and knows how blame was or was not attributed.